If any member on this forum can honestly deny that they have an 'I learnt about flying/engineering from that' story then they very probably don't fly or maintain aircraft.
While I agree that human error is always a risk, it is the scale of the error and the evident failure of the associated supervisory system which is the point here.
For 2 irreplaceable engines to be destroyed in the way they were is far from a mere 'I learned about servicing from that' situation.